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    • 3. 发明授权
    • Manufacture of flexible foams
    • 制造柔性泡沫
    • US4251639A
    • 1981-02-17
    • US28313
    • 1979-04-09
    • Wolfgang JarreHerbert StutzErnst Schoen
    • Wolfgang JarreHerbert StutzErnst Schoen
    • C08G18/00C08G18/72C08G18/76C08G18/80C08G18/14
    • C08G18/8035C08G18/8041
    • This invention concerns a process for the manufacture of flexible polyurethane foams from urethane-modified aromatic polyisocyanates having an NCO content of 15 to 30 percent by weight and a viscosity of 100 to 2000 centipoises at 20.degree. C., which are obtained by reaction of a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 55 to 85 percent by weight of diphenylmethane diisocyanate based on the total weight of the polyisocyanate mixture and a hydroxyl compound with 2 to 4 Zerewitinoff active hydrogen atoms and a molecular weight of 60 to 1500, in an equivalency ratio of NCO groups to active hydrogen atoms of the hydroxyl compound of 2:1 to 60:1, polyols, catalysts, blowing agents, and optionally, chain extenders, auxiliaries, and additives.
    • 本发明涉及一种由氨基甲酸酯改性的芳族聚异氰酸酯制备柔性聚氨酯泡沫体的方法,该聚氨酯改性芳族聚异氰酸酯在20℃下的NCO含量为15-30%(重量),粘度为100-2000厘泊,这是通过 基于多异氰酸酯混合物的总重量含有55-85重量%的二苯基甲烷二异氰酸酯和具有2-4个Zerewitinoff活性氢原子并且分子量为60至1500的羟基化合物的二苯基甲烷二异氰酸酯和聚亚苯基多亚甲基多异氰酸酯的混合物, NCO基团与羟基化合物的活性氢原子的当量比为2:1至60:1,多元醇,催化剂,发泡剂和任选的增链剂,助剂和添加剂。